Correctly handle utc timestamp for python 2.x. Backport again several things. This may be the last backport for 2.6 as the next time I'm thinking of discontinuing support instead of implementing 2.7 in 2.6... This should fix #306 and maybe #302.

demo/moulinrouge/tests.py

@@ -463,6 +463,7 @@ def get_test_routes(app):
         chart.add(10 * '1b', [(4, 12), (5, 8), (6, 4)], secondary=True)
         chart.add(10 * '2b', [(3, 24), (0, 17), (12, 9)], secondary=True)
         chart.add(10 * '2', [(8, 23), (21, 1), (5, 0)])
+        chart.value_formatter = lambda x: str(int(x)) + '+'
         return chart.render_response()
 
     @app.route('/test/box')
@@ -930,7 +931,7 @@ def get_test_routes(app):
             (datetime(2013, 1, 12, 8), 412),
             (datetime(2013, 1, 12, 8, tzinfo=tzn4), 823)
         ])
-        line.x_value_formatter = lambda x: x.isoformat()  # strftime("%Y-%m-%d")
+        # line.x_value_formatter = lambda x: x.isoformat()  # strftime("%Y-%m-%d")
         line.x_label_rotation = 45
         return line.render_response()
 

pygal/_compat.py

@@ -16,11 +16,12 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
+from __future__ import division
 """Various hacks for transparent python 2 / python 3 support"""
 
 import sys
 from collections import Iterable
-import time
+from datetime import datetime, timedelta, tzinfo
 
 
 if sys.version_info[0] == 3:
@@ -70,16 +71,32 @@ def total_seconds(td):
         ) / 10 ** 6
     return td.total_seconds()
 
+try:
+    from datetime import timezone
+    utc = timezone.utc
+except ImportError:
+    class UTC(tzinfo):
+        def tzname(self, dt):
+            return 'UTC'
+
+        def utcoffset(self, dt):
+            return timedelta(0)
+
+        def dst(self, dt):
+            return None
+    utc = UTC()
+
 
 def timestamp(x):
     """Get a timestamp from a date in python 3 and python 2"""
+    if x.tzinfo is None:
+        # Naive dates to utc
+        x = x.replace(tzinfo=utc)
+
     if hasattr(x, 'timestamp'):
-        from datetime import timezone
-        if x.tzinfo is None:
-            return x.replace(tzinfo=timezone.utc).timestamp()
         return x.timestamp()
     else:
-        return time.mktime(x.utctimetuple())
+        return total_seconds(x - datetime(1970, 1, 1, tzinfo=utc))
 
 try:
     from urllib import quote_plus

pygal/test/test_date.py

@@ -20,6 +20,7 @@
 """Date related charts tests"""
 
 from pygal import DateLine, TimeLine, DateTimeLine, TimeDeltaLine
+from pygal._compat import timestamp, utc
 from pygal.test.utils import texts
 from datetime import datetime, date, time, timedelta
 
@@ -158,3 +159,17 @@ def test_date_labels():
                 '2013-01-01',
                 '2013-02-01',
                 '2013-03-01']
+
+
+def test_utc_timestamping():
+    assert timestamp(
+        datetime(2017, 7, 14, 2, 40).replace(tzinfo=utc)
+    ) == 1500000000
+
+    for d in (
+        datetime.now(),
+        datetime.utcnow(),
+        datetime(1999, 12, 31, 23, 59, 59),
+        datetime(2000, 1, 1, 0, 0, 0)
+    ):
+        assert datetime.utcfromtimestamp(timestamp(d)) == d

tox.ini

@@ -14,5 +14,5 @@ setenv =
     COVERAGE_FILE=.cov-{envname}
 
 commands =
-  coverage run --source=pygal {envbindir}/py.test pygal/test --junitxml=junit-{envname}.xml --flake8
+  coverage run --source=pygal {envbindir}/py.test {posargs:pygal/test} --junitxml=junit-{envname}.xml --flake8
   coverage xml -o coverage-{envname}.xml